User's Manual

Table Of Contents
ECLIPSE INSTALLATION MANUAL
DAC 155eM
DAC 155eM multiplexes an OC3 electrical tributary to an NxDS1 backplane. The user
interface is provided on an SFP electrical transceiver.
It functions as a terminal multiplexer; it terminates or originates the OC3 frame. It
does not support interconnection of ADMs as there is no provision to transport OC3
overheads for ADM to ADM synchronization.
In virtual tributary mode it transports up to 130 Mbit/s Ethernet over an OC3 link.
Options are provided for external/recovered, or internal clock sourcing.
Figure 1-14. DAC 155oM
AUX
AUX provides synchronous and/or asynchronous auxiliary data channels, NMS port-
ing, and alarm input and output functions. Data options are sync at 64 kbps or
async to 19.2 kbps.
Figure 1-15.
NCC
The NCC is a mandatory plug-in for an INU/INUe. It performs key node man-
agement and control functions, and provides various dc rails from the -48 Vdc
input. It also incorporates a plug-in flash card, which holds Node configuration and
license data.
Power input limits are -40.5 to -60 Vdc. The power connector is a D-Sub M/F 2W2.
The +ve dc return pin is connected to chassis ground.
Figure 1-16. NCC
FAN
The FAN is a mandatory plug-in. There are two variants, 2RU and 1RU. Each is fit-
ted with two long-life axial fans plus monitoring and control circuits.
One 1RU FAN is fitted in an INU.
One 2RU FAN or two 1RU FANs are fitted in the INUe. The 2RU FAN is standard.
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